“Joe has been very supportive of the labor movement for the last 40 years. He stands for working families. We recognize he’s a great candidate,” John Costa, international president of the 200,000-member Amalgamated Transit Union, told POLITICO. “We think Joe can beat Donald Trump.”

The issue of Biden’s electability was the driving force behind the decision and a key concern of the union’s membership, which was randomly surveyed by phone in an “extensive poll” conducted by a professional pollster ATU hired, Costa said.

“The numbers came back very strong for Joe,” Costa said, declining to discuss details of the “internal” survey. “Not only did people support him, but we asked who would be best to beat Trump, and he was overwhelmingly seen as the best to do it.“